<!doctype html>
<style>
span { 
  width: 50px; height: 50px; margin: 5px; 
  display: inline-block; background-color: green;
}
</style>
<span id="a"></span>
<span id="b"></span>
<span id="c"></span>
<span id="d"></span>
<span id="e"></span>
